Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:25258a
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السيوطي:٢٥٢٥٨a

"لَا تَقُومُ السَّاعَةُ حَتَّى يَمْلِكَ النَّاسَ رَجُلٌ مِنَ الْمَوالِى يُقَالُ لَهُ جَهْجَاه".  

[طب] الطبرانى في الكبير عن علباء السلمى

See similar narrations below:

Collected by Tirmidhī, Ṭabarānī, Suyūṭī
tirmidhi:2228Muḥammad b. Bashhār al-ʿAbdī

"The night and the day shall not go away until a man called Jahjah among the Mawali reigns."  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Gharīb.
الترمذي:٢٢٢٨حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ الْعَبْدِيُّ حَدَّثَنَا أَبُو بَكْرٍ الْحَنَفِيُّ عَنْ عَبْدِ الْحَمِيدِ بْنِ جَعْفَرٍ عَنْ عُمَرَ بْنِ الْحَكَمِ قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَذْهَبُ اللَّيْلُ وَالنَّهَارُ حَتَّى يَمْلِكَ رَجُلٌ مِنَ الْمَوَالِي يُقَالُ لَهُ جَهْجَاهُ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ

عَلْيَاءُ السُّلَمِيُّ

tabarani:15308Muṭṭalib b. Shuʿayb al-Azdī al-Miṣrī > Ḥuṣayn b. Muḥammad > ʿAlī b. Thābit al-Jazarī > ʿAbd al-Ḥamīd b. Jaʿfar from his father > ʿAlyāʾ al-Sulamī

[Machine] I heard the Messenger of Allah ﷺ saying, "The Hour will not be established until a man from the Mawali (non-Arab Muslims) has dominion, called Jajjah."  

الطبراني:١٥٣٠٨حَدَّثَنَا مُطَّلِبُ بْنُ شُعَيْبٍ الْأَزْدِيُّ الْمِصْرِيُّ ثنا حُصَيْنُ بْنُ مُحَمَّدٍ ثنا عَلِيُّ بْنُ ثَابِتٍ الْجَزَرِيُّ عَنْ عَبْدِ الْحَمِيدِ بْنِ جَعْفَرٍ عَنْ أَبِيهِ عَنْ عَلْيَاءَ السُّلَمِيِّ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ لَا تَقُومُ السَّاعَةُ حَتَّى يَمْلِكَ النَّاسَ رَجُلٌ مِنَ الْمَوَالِي يُقَالُ لَهُ جَهْجَاهُ